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N.o.- 79.538." Patnted July 1, 1868'.

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JOHN R; ANDERSON, or BROOKLYN, nEW YoRKt Betters Patent No. 79,538, dated July 7,1858.

IMPROVEMENT 111 FOG-ALARMm flit: 5ttrttle nfmt It in than firms hatedmrt ma'titg tattttitg arms,

Beit'known that I, Joan R. ANDERSON, er Brooklyn, in the county of Kings, and State of New York d have invented a new and useful Improvement in Fog-Horns; and I hereby declare that the following is a full, iiclear, and exact description of the same, reference being had to the accompanying drawings, forming a. part of this specification, in which is represented alongitu'dinal section ofa. fog-horn constructed according .to my improvement.

"I will proceed to describe it with re ference to the drawings.

' The object of this invention is to furnish a compact and convenient and easily-operated device for thesignailing on vessels during the time of fogs; and consists in a novel arrangement, within a hollow cylinder, of a" trumpet, which is acted upon by compressed air, by means of a h ollow plunger,- fitted to work within the cylinder, and whereby extreme compactness is given to the apparatus the cylinder, and within the hollow plunger operating therein.

In order that others may be-better enabled to un'derstandthe construction and operation ofmy invention,

A is a hollow cylinder, resting in a suitable foundation-bed, D. B is a trumpet, inserted, into one end of thecylinderA; which is closed, and held firmly therein by screws passing through a flange on the bellof the vtrumpet, and securing said flange to the outer end of the cylinder A, the whole or nearly the whole of the entire length of the trumpet being within the cylinder, and thus occupying the-least practicable room, and being pro v.teoted from injury. a isa reed, of substantially the some construction as those commonly used in reed-organs, and inserted into the inner end of the trumpet B. Cis a hollow'plunger, closed at its outer end, and wo -king,

cylinder A, substantially as herein described for the purpose set forth.

by means of a crank and pitlrian, into the cylinder A, and/over and around the t'rhmpet'B, so that tlgc alternate vcompression of the air caused by the reciprocation of the plungerO, acts upon the reed a in the endof the by the. arrangement of the trumpet withintrulnpet B, producing asound thereby, which will be heard ahd'distinguished to a distance in proportionto th'e size of themachinel A more continuous s'oundmay be given from the invention, by the'use of two or more plungers, operated by a double crank set at right angles to each'o'ther on the shaft; or the same may be effected with one crank and plunger, by the addition of a reversed reed on the opposite side of-the trumpet B. What I claim as my invention and desire to secure by Letters Patent, isv The arrangement of the trumpet or horii B and hollow plunger 0, relatively to each other, and with the e JOHN ANDERSON. Witnesses T. T, HALLIGAN; En. P. TRACY- 

